Can the backup pump’s mechanical seal withstand the pressure at the pump outlet?
Thread Content
The centrifugal pump uses butane as its medium; the outlet pressure is 6.5 MPa and the inlet pressure is 4.0 MPa. It is equipped with a dry gas mechanical seal, the outlet valve of the pump has a pressure rating of 10 MPa, while the inlet valve has a rating of 6.4 MPa. Currently, due to the online debugging of the electric control valve for export, it is necessary to keep the outlet valve of the standby centrifugal pump fully open and the inlet valve fully closed. It has been confirmed that there is internal leakage in the pump’s check valve. Is there a risk of overpressure leakage in the pump’s dry gas seal and other sealing components?
Based on your description, it seems there’s no problem.
The pressure at the pump outlet is already greater than the pressure that the pump inlet valve can withstand; it is not recommended to proceed in this manner
With an outlet pressure rating of 10 MPa, it is clear that the seal can withstand the pressures encountered during normal operation; therefore, there is no need to close the outlet manual valve
The pressure in the sealed chamber is much lower than the pressure at the medium outlet, and slightly higher than the inlet pressure – there’s no problem with that!
It’s better to use a primary seal or a mechanical seal; whether it can handle the required conditions depends on the design pressure of the seal